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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d7da7cebba6a21827efd59b60f4adeaaa95d9656e8a3e67ff958cd9ca2c711c' 
  AND token = 'Nmi8hTVen/LGRig1T3A0szLE/gV8OgeN2tJS0kl9Op4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}